My wife and I always look for good deals on Facebook Marketplace and craigslist.
You never know when you will find something cheap that can be sold for a higher price.
I like to go to flea markets, auctions, and yard sales for the same reason. One time I went to an auction and I bought a plate for $3. I know the plate had significant value, because I recognized the name of the artist on the back of the plate. I bought the plate for $3 and I sold it online for $125. I had an equally nice experience one time when I was trolling around on the marketplace. I found an old oil lamp that was broken and no longer working. The person on the Marketplace was trying to sell the oil lamp for $10. I bought the lamp for six bucks and I took it home and fixed it up and sold it for 60 bucks. Last weekend, my wife and I went to the flea market. We were walking around most of the morning. We didn’t really find anything interesting to buy until I got to a stall where an old man was selling rebar supplies. The guy had boxes of rebar supplies like double loop wire ties and coils of tie wire. I use these rebar supplies in my construction job and I know how much the double loop wire ties and cool wheels of rebar tie wire can cost. The guy at the flea market was selling the rebar supplies at a fraction of the cost. I told the guy that the prices were really low and he encouraged me to buy the entire lot.